Inductance apparatus



June I 1926a J. F. LINDBERG INDUC'IANCE APPARATUS Filed Sept. '25, 1922 Patented June 1, 192 6.

UNITED STATES JOHN F. LINDBERG, OF CHICAGO, ILLINOIS, ASSIGNOR TO RELIANCE DIE & STAMP- ING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

INDUC'IANCE APPARATUS.

Application filed September 25, 1922. Serial No. 590,271.

My invention relates to inductance devices and employs an electric condenser and a reactance coil in inductive Ielationtherewith.

In the preferred embodiment of the 1nvention the reactance coil surrounds the condenser and means are provided for adjusting the angular relation of the two elements of the device to vary their inductive relation. Means are also preferably employed for adjusting the capacity of the condenser. v

The instrument of my invention is of particular service when the coil thereof is serially included in the antennae of a w reless receiving station, though the invention is not limited to any particular use to which,

it may be put.

I The invention Will be more fully describedin connection with the accompanying drawing in which Fig. 1 is an-end view of the instrument as it is preferably constructed; Fig.2 is a sectional View on line 22 of Fig. 1, a portion being broken away to reveal some structural characteristics; Fig. 3 is a circuit diagram illustrating the manner in which the instrument may be included in an aerial; and Fig. 4 is a'view, somewhat diagrammatic, illustrating a different adjustment from that which appears in Fig. 2.

Like parts are indicated by similar characters of reference throughout the different figures.

The reactance coil of wire 1 is desirably wound about a coil supporting cylinder 2. The reactance coil and its mounting are sandwiched at the lower portions thereof between insulating blocks 3 and 4, screws 5 passing through the block 3 and the coil mounting into the block 4 to maintain the parts 2,3 and 1in firm assembly. The block A: is rigidly supported upon a shaft 6 that "is journaled at its ends in the sides of a U- shaped mounting 7 A coiled spring 8, located" upon one side of the shaft 6, presses upon the block 1 and, when free to function, turns the block and the parts assembled therewith in a clockwise direction as the structure is viewed ,in Figs. 2 and 4.

12 by which it may be turned to adjust the the equipment.

location of the inner end of the screw to determine the position in which the arm 9 and the parts in fixed assembly therewith are to'be brought by the spring8.

The condenser illustrated includes a nonadjustable side composed of a group of electrically connected plates 13 and an adjustable group of electrically connected plates '14. The plates 14 are fixed upon a rotatable shaft 15 that is journaled to turn in the walls 16 between which the condenser sides are disposed and to which the nonadjustable group of plates 13 are secured. The condenser structure is mounted upon the wall 16 of the cabinet which contains The shaft 15 extends through this wall and is provided upon the exterior thereof with a knob 18 by which the condenser capacity. The knob 12 upon the shaft 10 is also upon the exterior of the cabinet wall 17.

The inductive relation between the condenser and reactance coil is determined by the positlon occupied by the reactance coil through the instrumentality of the adjusting screw 10 and the adjusting spring 8.

This adjustment, supplemented by the means for regulating the capacity of the' condenser, makes the instrument of particular service when employed in the aerial of a wireless receiving station. If desired, means may be provided for adjusting the reactance of the coil, the means employed preferably serving to vary the ampere turns. I have illustrated a switch 19 that is connected with the aerial 20 and which may be brought into circuit connection with any of the buttons 21 connected with various parts of the coil.

While I have preferred to surround the condenser by the reactance coil and to make this coil adjustable in position 1 do not wish to be limited to such an arrangement nor to other details of construction illustrated as changes may readily be made without departing from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Patent the following:-

1. The combination with an electric condenser; of a wire coil surrounding and in inductive relation with the condenser; a

mounting upon which the wire coil is pivoted upon one side of its axis to enable it to be adjusted with respect to the condenser; a coiled spring pressing upon this coil in one of its turning directions, and an adjusting screw operating to turn the 0011 in an opposite direction against the force of the spring.

2. The combination with an electric condenser; of a wire coil surrounding and in inductive relation with the condenser; and amounting upon which the wire coil is movable to change its inductive relation to the condenser.

3. The combination with an electric condenser; of a wire coil surrounding and in inductive relation with the condenser, and a mounting, adjustable in position, for one of the aforesaid elements permitting this element to be moved as an entirety with respect to the other, whereby the inductive relation of the aforesaid elements may be varied.

In Witness whereof, I hereunto subscribe my name this 21st day of September A. D., 1922.

JOHN F. LINDBERG. 

